Distributing device for four-stroke-cycle internal-combustion engines.



, L. GHEVANGE; 1 4 DISTRIBUTING DEVICE POR FOUR STROKE GYOLE'INTERNAL GOMBUSTION ENGINES.

APPLICATION I'ILBQ MAY A-1912.Y 1 11,124,861 Patented Jan. 12, 1915.

1T sans LUCIEN CHEVANCE, OF AUXERRE, FRANCE.

DISTRIBUTING- DEVICE FOR oURTRKE-CYCLE*INTERNAL-CMBUS'IIN ENGINES.

Specification of Letters Patent.

Patented aan. 1a, i915,

Application filed May 7, 1912. Serial No. 695,776.

To all whom 'it may concern Be 1t' known that I, LUCIEN CHEVANCE,

\- citizen of France, residing at Auxerre,

-Yonne, France, have invented new and usesaid improvements consists in arranging the ports ofv the distributing device, according to helices, Iin order to insure the maximum sectional area for the passages of the gas,

and a rapid opening and closing ofthe said passages, this arrangement vpermits also the application of helicoidal segments, insulating entirely one portof the distributing device from the other and' insuring a perfect tightness. Further, the said arrangement insures the forced lubrication of the distribf uting device.

,Another characteristic feature of the said improvements consists in operating the distributing device 1n such a manner as, .by

suitably mounting the distributer upon its shaft, the periods of retardation of its movement may be caused to coincide with the periods corresponding to the opening-of the passages between the distributing device and the cylinder or cylinders of the motor, while at the same. time the periods of acceleration of the motion, may be caused to coincide with the periods corresponding tothe closing of the said passages..

In order to facilitate the understanding of the description 'of the device in question, the annexed drawings represent by'way of example in Figure 1 a side elevation of the principal part of the distributing device; Fig. 2 anv elevation partly in sectionv` according to line II-'II of F ig. 3, illust-rating the application of the device to. a motor having two cylinders; Eig.` 3 isa sectional elevation talren'pn the line III- III of Fig. 2.

Throughout the various figures of the drawings, the same letters designate. the same parts.l l.

Referring to F ig. 1 of the drawings it will be seen. that the distributer comprises a hollow circular cylinder 1, Lon the pe- I ripheryof which are formed ports such as 2 and 3. If the distributer 1 serves for controlling the admission and the exhaust of the motive Huid, it is divided into two portions c, c by an interior partition -t, of helical form which entirely separates'the ports-2 and 3 from each other. The chambers a and e of the distributingdevice communicatel respectively with the passage A, through which the motive iiuid is admitted, and with the passageE corresponding to the exhaust of the cylinder or cylinders 4of the l motor. Uponv the outer peripheryof Vthe distributer 1 vthe ports 2 and 3 Aare separated from `each other by a large helical segment over furnished with other helical segments 6, 7, arranged in such a manner that the internal and externalslips of eachport are 5. The 'periphery of the distributer is moresituated as close as possible to each segment so that whatever maybe the position of the distributing device one ofthe two segments will always form a tight closure, and there will never be communication between the admission and the exhaust compartments. The `segments -61 and 7 extend to circular segments 8 and 9 arranged at right angles to the axis ofthe distributer. In the lower part of the compartment a into which the A supply conduit A opens, the sleeve ,l is 'pro vided with helical blades 10, 11 `which constitute a sucking and stirring device for the gas tobe applied to the motor. In the upper part of chamber e which communicates` with the exhaust conduit E, the sleeve l is I provided. withv an internal ,stationary sleeve 12 which is securedfposition by a screw plug 13. This sleeve 12 is-intended to prevent the exhaust gases from remaining too long in contact with the distributing device.

'With this' arrangement the upper part of the sleeve 1 issuflicientlycooled by the circulation of the water jacket A14C of the motor which extends over the corresponding part ofthe cylinder 15. The cylinder 15 4of the distributer 1 ismade integral with the cylinder or cylinders, such as C" and C2., of

the motor, the ports 16, 17 of these cylinders terminating in helices in the vcylinder 15, so as to have opposite the ports 2 and 3 of the sleeve l areas corresponding to these ports. The ports`in the walls of the distributer cylinder, which communicate with vthemotor cylinders, may be disposed in the interior of the mhotor cylinders insuch a man`- ner that each of the corresponding pistons closes the corresponding port completely at the beginning of the stroke to a degree suflicient to prevent the explosion having any effect upon vthe distributing device, but not sufficient to preventthe beginning of the ad- -mission at the beginning of the stroke. The Y piston will therefore during itsdescent after n passing the dead point open the port by the same amount as the distributing device which has the effect of relieving the latter at the moment when the strain is greatest,

` without impairing the charging of the cylinder which would otherwise be the case if the port were placed lower down. n

The distributing sleeve 1 is actuated in the construction shown in Figs. 1 and in the following manner: The lowerl .part 'a of the sleeve, is -in the examples shown made integral with a shaft 18 which is connected by a universal joint 19 to a shaft 20. The shaft 20 is inclined at an angle c with regard to the shaft 18 and carries an endless screw 21 which is iixed'upon the shaft and coper-` ates with a helicoidal gear 22 keyed upon the lcrank shaft M of the motor. Upon the `cranks of this shaft are mounted the heads of the connecting rods B', B2 connected to the pistons I, P2 working in the cylinders C, C2. It should be noted that owing to the shafts 18 and 2O being arranged at an angle with regard to each other, and connected by means of the-joint 19, the shaft 2O will im.

.partto the' shaft 18 a non-uniform movement which comprises two periods of acceleration and 'two periods of retardation. By fixing the distributing sleeve suitably upon'the shaft 18 one may cause the periods of retardation to correspond with the opening of the communications. f

The improved device forming the subject j of. the present invention may be applied to motors'having one, two, four or more cylinders. :Figs 2 and 3 of the drawings represent by way ofeXample a motor having two cylinders, the' pistons P. and P2., ofwhich l i ed at b, 2

are provided with hemispherical end faces, the ignition being effected by igniters mountin the covers of the cylinders. .These figures also illustrate a very simple .device for driving the magnets for supplyv ing the ignition current, which permits of the dynamo sbeing placed parallel to the ranged at the top of the cylinder 15, without main crank shaft ofthe motor. For this purpose the shaft 2O has keyed to it a heli- 'coidal gear 23 which meshes with a corresponding gear 24 fX'edupon the shaft 25 of the dynamo.

It should be noted that the described arrangement enables the distributing` device to be rapidly dismounted, it being sufficient for that purpose to unscrew the plug .13 are oving lany other parts.

"1. motor constructed according tothe presn ent invention does not present upon its casing C any outward projection or any moving part outside the casing; the casing moreover has very reduced dimensions owingto the omission of the parallel eountershaft. I claim:y

1.' Improvements in distributing devices for four stroke cycle internal combustion engines, the said improvements comprising a. hollow cylindrical sleeve driven from the `motor shaft; a helical partition separating this sleeve into two compartments corresponding to the admission and the discharge ofthe motive Huid; helical portsin this sleeveA separated from each other by helical A.

segments; .circular segments 'provided at both. ends .of the sleeve andl arranged at right angles to its axis, in order to insure a tight joint between the sleeve 4and the cylinder` receiving this latter; Aconnections between'the said cylinder and the motor cylinder or cylinders; ports corresponding to those of the sleeveyand insuringcommunicationA between. the compartments of the sleeve and the interior of the cylinder or cylinders at the proper times, so as toinsure `the performance of the various phases ofthe cycle. l. f

2. Improvements inv distributing devices for four stroke cycle internal combustion engines, the said improvements comprising a hollow cylindrical sleeve driven' from the motor shaft; a helical partition separating this sleeve into two compartments corresponding to the admission and the discharge of the motive fluid; helical ports in this sleeve separated from eachother byqhelical segments; circular segments provided at both ends of the sleeve and arranged at right angles to its axis, in order to insure a Y tight joint between the sleeve and the cylinder receiving this latter; connections between the said cylinder and the motor cylinder or cylinders; ports corresponding to those of the sleeve and insuring communi- .1 Acation between the compartments of the with the latter.

3. Improvements in distributing devices for four stroke cycle internal conibustiongenAA gines, the said improvements comprising hollow cylindrical sleeve driven from the motor shaft; a helical partition. separ; this sleeve into two compartments ce sponding to the admission and the disch segments; 'circular segments provided at both ends 'of-l the sleeve and arranged at right angles to its axis, in order to insure a tight jointbetvveen the sleeve and the cylinder receiving this latter; connections bel tween the said cylinder 4and the motor cylinder or cylinders; ports corresponding to those ofthe sleeve and insuring communication between the compartments of the performance of the various phases of the cycle; and suitable means for impartingto the distributing sleeve an irregular rotary motion about its axis in such a manner that the periods of retardation of the movements imparted to the sleeve corresponds to the opening of the passages between the distributing device and the motor cylinder or cylinders, and that the periods of acceleration. of said movement correspond with the closing of the said passages.

In testimony whereof I have'signed my name to this specification in the presence of two subscribing Witnesses.

p i LUC-IEN Cl-IEVANCE.

Witnesses: i I

.JULES DAYOLLET,

ANDR BOBDILLON. v

zov 

